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Products that do what ConfigClarity – Visualize cron overlaps before they crash your server does
Built this after dealing with overlapping cron jobs that quietly exhausted server resources. The cron daemon will happily spawn multiple copies of your script simultaneously until your server runs out of memory — with no warning. Paste your crontab (supports standard crontab -l format), and it shows a 24-hour timeline with overlap detection, Server Load Warnings, and human-readable job descriptions. No signup. No data leaves your browser. Everything runs client-side. Would love feedback from anyone who runs cron jobs in prod. https://configclarity.dev
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I wanted to see how fast an isolated code sandbox could start if I never had to boot a fresh VM. So instead of launching a new microVM per execution, I boot Firecracker once with Python and numpy already loaded, then snapshot the full VM state. Every execution after that creates a new KVM VM backed by a `MAP_PRIVATE` mapping of the snapshot memory, so Linux gives me copy-on-write pages automatically. That means each sandbox starts from an already-running Python process inside a real VM, runs the code, and exits. These are real KVM VMs, not containers: separate guest kernel, separate guest…
Mar 2026 · github.com
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2015 · github.com
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I have been pushing up to 90 commits a day on a MacBook Air via 4-5 parallel agents. As you can imagine when all the agents try to build, test and run dev servers on an 8GB machine it is the fast lane to a force quit and restart. I also did not want to pay the CI minutes on 90 pushes a day. So I designed a local merge queue to have all commits land one at a time and fully tested. Hopefully this helps other folks with more modest machines. Appreciate any feedback.
Jul 2026 · github.com
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2020 · github.com
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Tabs, splits, and tmux work fine until you have several projects open with logs, tests, and long-running shells. I kept rebuilding context instead of resuming work. Horizon puts shells on an infinite canvas. You can arrange them into workspaces and reopen later with layout, scrollback, and history intact. Built in 3 days with Claude/Codex, dogfooding the workflow as I went. Feedback and contributions welcome.
Mar 2026 · github.com
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2020 · blog.cronhub.io
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2017 · healthchecks.io
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2014 · cronitor.io
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Jun 2026 · github.com
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2014 · github.com
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Free visual cron schedule builder with real-time preview
Jun 2026 · cron-gen-tools.pages.dev
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I run 3mins.news (https://3mins.news), an AI news aggregator built entirely on Cloudflare Workers. The backend has 10+ cron triggers running every few minutes: RSS fetching, article clustering, LLM calls, email delivery. The problem: Workers Paid Plan has hard monthly limits (10M requests, 1M KV writes, 1M queue ops, etc.). There's no built-in "pause when you hit the limit", CF just starts billing overages. KV writes cost $5/M over the cap, so a retry loop bug can get expensive fast. AWS has Budget Alerts, but those are passive notifications, by the time you read the email,…
Mar 2026
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We’re the makers of Crontab.guru and Cronitor.io, both first launched on HN about a decade ago. We wanted a secure web GUI way to manage/run our own cron jobs — so we built it and open‑sourced it! With Crontab Guru Dashboard you can: * Create, update, suspend and delete your cron jobs easily * Start a job on-demand or kill running instances that are hanging around too long * Debug jobs with a local console * Use our MCP server to integrate with coding assistants like Cursor and Claude Code to configure jobs and check health/status Feedback welcome!
Sep 2025 · crontab.guru
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2018 · cronhub.io
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